GB679723A - Improvements in or relating to sine-cosine voltage generators - Google Patents
Improvements in or relating to sine-cosine voltage generatorsInfo
- Publication number
- GB679723A GB679723A GB1531949A GB1531949A GB679723A GB 679723 A GB679723 A GB 679723A GB 1531949 A GB1531949 A GB 1531949A GB 1531949 A GB1531949 A GB 1531949A GB 679723 A GB679723 A GB 679723A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- voltage
- pulses
- cathode
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/04—Display arrangements
- G01S7/06—Cathode-ray tube displays or other two dimensional or three-dimensional displays
- G01S7/10—Providing two-dimensional and co-ordinated display of distance and direction
- G01S7/12—Plan-position indicators, i.e. P.P.I.
Abstract
679,723. Phase measurement; current and voltage measurement. DECCA RECORD CO., Ltd. July 26, 1950 [June 8, 1949], No. 15319/49. Class 37. [Also in Group XL (c)] The invention relates to a combination of two circuits for producing D.C. voltages respectively proportional to two A.C. voltages which respectively represent in amplitude and polarity the sine. and cosine of an angular position. In each circuit the A.C. voltage is used to amplitude modulate short duration pulses which occur in synchronism with the A.C. voltage and the required D.C. voltage is derived from the pulses. The modulation may be achieved by adding to the A.C. voltage short pulses 11 of constant amplitude, preferably at the peak of the cycle and the D.C. voltage may be obtained from the portion of the pulse above a datum level 12. Alternatively, in the circuit shown, positive pulses applied to the grid of a triode V1B raise the corresponding cathode potential rendering a diode V2B conducting and applying a pulse to the grid of a valve V3. When the diode anode potential reaches the potential of the cathode of a triode V1A a diode V2A conducts and prevents any further rise of D.C. output pulse. The potential of the cathode of VIA and thus the peak value of the pulse applied to the grid of valve V3 depends on the instantaneous value of the 1000 c/s. A.C. voltage applied to the grid of valve V3. A D.C. restorer diode V4 is connected to grid of V3 and the grid is biased beyond cut-off so that only the peaks of the pulses render the valve conducting. The anode current pulses are integrated in a circuit R10, C3 and the resulting output is applied to a cathode follower stage V5. The D.C. output of the cathode follower stage is applied as negative feed-back to the grid of the input triode V1A and this reduces distortion and obviates the necessity of ensuring that the amplitude of the applied pulses is greater than the peak-to-peak value of the A.C. wave input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1531949A GB679723A (en) | 1949-06-08 | 1949-06-08 | Improvements in or relating to sine-cosine voltage generators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1531949A GB679723A (en) | 1949-06-08 | 1949-06-08 | Improvements in or relating to sine-cosine voltage generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB679723A true GB679723A (en) | 1952-09-24 |
Family
ID=10056984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1531949A Expired GB679723A (en) | 1949-06-08 | 1949-06-08 | Improvements in or relating to sine-cosine voltage generators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB679723A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2965849A (en) * | 1955-12-07 | 1960-12-20 | Decca Record Co Ltd | Demodulators |
| CN111725951A (en) * | 2019-03-20 | 2020-09-29 | 丰田自动车株式会社 | Motor system |
-
1949
- 1949-06-08 GB GB1531949A patent/GB679723A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2965849A (en) * | 1955-12-07 | 1960-12-20 | Decca Record Co Ltd | Demodulators |
| CN111725951A (en) * | 2019-03-20 | 2020-09-29 | 丰田自动车株式会社 | Motor system |
| CN111725951B (en) * | 2019-03-20 | 2022-10-18 | 株式会社电装 | Motor system |
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